Issue #5663 has been updated by yhara (Yutaka HARA).
Target version changed from 2.0.0 to next minor
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Feature #5663: Combined map/select method
https://bugs.ruby-lang.org/issues/5663#change-31552
Author: wycats (Yehuda Katz)
Status: Feedback
Priority: Normal
Assignee: matz (Yukihiro Matsumoto)
Category: lib
Target version: next minor
It is pretty common to want to map over an Enumerable, but only include the elements that match a particular filter. A common idiom is:
enum.map { |i| i + 1 if i.even? }.compact
It is of course also possible to do this with two calls:
enum.select { |i| i.even? }.map { |i| i + 1 }
Both cases are clumsy and require two iterations through the loop. I'd like to propose a combined method:
enum.map_select { |i| i + 1 if i.even? }
The only caveat is that it would be impossible to intentionally return nil here; suggestions welcome. The naming is also a strawman; feel free to propose something better.
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